JPS62200649A - Fluorescent luminous tube - Google Patents

Abstract

PURPOSE:To improve the color mixture and the color balance, and unify the nonluminous areas between dots, by composing an envelope, of a hexagonal base plate, hexagonal tubular side plate, and a hexagonal rear plate. CONSTITUTION:A base plate 2 is made by cutting off four corners of a rectangular glass plate P. At the inner side of the periphery of the base plate 2, a regular hexagonal tubular glass side faces 3 are fixed by frit glass with a low melting point or the like. At the opened end of the side plates 3, a rear plate 4 of a regular hexagonal glass plate is fixed, to compose an envelope 5. Then, the luminous area of the base plate 2 is divided into three and each area are covered with phosphors r, g, and b to radiate red green, and blue colors respectively. In such a way, dots of different colors can be arranged neighboring each other to compose the display screen, and the color mixture and the color balance can be improved. Moreover, the mutual intervals of the dots can be made equal, and so the nonluminous area can be unified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of an envelope for a fluorescent light emitting tube. Fluorescent light emitting tubes having the structure according to the present invention are particularly effective when they are arranged closely to form a display screen of a large display device.

[Prior Art] Fluorescent light emitting tubes are generally manufactured in a high vacuum atmosphere (1 x 10-'
A filamentary cathode that emits electrons into an envelope held at ~l x 1G-' Torr), a control electrode that accelerates and controls the emitted electrons, an anode coated with phosphor, etc. i? In recent years, a technology that displays a single image by arranging a large number of fluorescent light emitting tubes as zero light emitting cells densely to form a large display screen has been attracting attention in recent years. However, the structure of fluorescent light emitting tubes for large display devices is not that different from the ones described above.
It operates on the same principle as known fluorescent light bulbs. In general, fluorescent light emitting tubes have an anode voltage of t! They are classified into low-voltage fluorescent light-emitting tubes that are driven at l+oov or less, and high-voltage fluorescent light-emitting tubes that are driven at high voltages of several kV to 10-odd kV, but in either case, the interior is in a high vacuum atmosphere. It has an envelope held in it.

In conventional fluorescent light emitting tubes, regardless of whether they are for high pressure or low pressure, the envelope generally has a flat box shape, and the substrate serving as one light emitting display section has a rectangular shape. The fluorescent light emitting tubes that serve as the light emitting cells that make up the large display screen similarly have rectangular substrates, and each fluorescent light emitting tube has a red color in order to display in full color.

When attempting to provide phosphors that emit light in each color of green and blue, the light emitting area of the rectangular board is divided into three at right angles to the longitudinal direction, and one fluorescent tube is placed in each area, as shown in Figure 14. A large number of pixels were arranged to form a display screen of a large display device capable of full-color display.

[Problems to be solved by the invention] Since the conventional fluorescent light emitting tube has a rectangular substrate,
The shapes and arrangement order of the dots R, G, and H that emit light in red, green, and blue colors are generally as described above, but this has the following problems.

1. One pixel (one fluorescent tube in this example) shown in Figure 14
Among them, dot R and dot G, and dot G and dot B) are adjacent, so color mixing is good, but dot R and dot B are far apart, so color mixing is not successful.

2. Vertical stripes are noticeable, the color balance is poor, and the display of fine details becomes poor.

3. In Figure 14, when trying to display a primary color (for example, red) in the direction along the horizontal row, there are two dots of other colors (in this case, 1 & and blue) between the dots next to the same color. The same applies to the diagonal direction, where the dovetail intervals are too large and clear display cannot be made.

4. In the example of Fig. 14, the drums at both ends) R and B)
is adjacent to the side plates in three directions (up, down, and side) in the figure, but the central driver ()G is in contact with only the side plates in two directions, up and down. Since the portion to which the side plate is sealed does not emit light, when such fluorescent tubes are closely arranged, gaps are created between dots in adjacent fluorescent tubes where no light is emitted.

However, since there were no gaps between the dots in the fluorescent light emitting tube, the gaps between the dots on the display screen were uneven.

On the other hand, if non-light-emitting parts are provided on both sides of the central dot G in order to balance the gaps between the dots, the light-emitting area in the fluorescent tube cannot be used effectively.

[Objective of the Invention] It is an object of the present invention to provide a fluorescent light emitting tube that has good color mixing, excellent color balance, and uniform non-emitting areas between dots.

[Structure of the Invention] The fluorescent light emitting tube of the present invention has a filament-shaped cathode that emits electrons, a control electrode that controls the electrons, and a phosphor covered within an envelope maintained in a high vacuum atmosphere. A fluorescent light emitting tube having an anode, a hexagonal substrate portion on which a fluorescent material of the anode is adhered, and a terminal portion of various electrodes etc. that is disposed opposite to the substrate portion and is provided through the hexagonal substrate portion. The envelope is characterized in that the envelope is constituted by a rear surface portion having a cylindrical shape and a cylindrical side surface portion provided between a periphery of the substrate portion and the rear surface portion.

[Embodiment] FIGS. 1 to 4 show a first embodiment of the present invention. This fluorescent light emitting tube 1 is for low voltage use, and is a so-called front-emission type fluorescent light emitting tube in which light emission from a display section is observed through a transparent substrate.

2 in the figure is a regular hexagonal substrate portion 2 (hereinafter referred to as substrate 2).
), and the substrate 2 can be manufactured by cutting jLwA of a rectangular glass plate P as shown in FIG. A regular hexagonal cylindrical glass side surface 3 is fixed to the inner surface of the peripheral edge of the substrate 2 with a sealing material such as low-melting frit glass. A back surface portion 4, which is a regular hexagonal glass plate, is sealed and fixed to the other end of the opening of the side surface portion 3, and the back surface portion 4 emits fluorescent light. One envelope 5 is configured.

The side surface portion 3 may be made by assembling six rectangular glass plates with a sealing material, or may be made by heating and softening a round glass tube and molding it in a hexagonal mold. Alternatively, the plate glass may be formed into a generally U-shaped member with a widened opening groove, and two pieces of this may be joined facing each other.

Next, on the inner surface side of the substrate 2, three mutually independent parallelogram-shaped patterns dividing the area of the substrate 2 into three equal parts are formed with a transparent conductive film (ITO film, NESA film, etc.), The anode conductor 6 is used as the anode conductor 6. Then, three types of phosphors r, g, and b that emit light in each color of red, green, and blue are deposited one by one on the surface of each of these anode conductors 6 by a method such as electrodeposition or printing. R, G, B are formed, one pixel RGB
is configured.

Wiring conductors 7 connected to each of the anode conductors 6 are provided on the inner surface of the side surface portion 3.

The wiring conductor 7 may be a conducting wire, but in this embodiment, aluminum is deposited on the entire inner surface of the side surface 3, and only the aluminum at three corners is removed. Further, instead of using a thin film such as a vapor-deposited film, Ag paste may be poured into the corners of the side surface portion 3 to form the wiring conductor.

Each of the wiring conductors 7 extends to the back surface 4 and is connected to an inner end of an anode terminal 8 provided through the back surface 4 in an airtight manner. Further, a cathode terminal 9 and a control electrode terminal 10 are provided to pass through the back surface 4 in an airtight manner. The inner end of the cathode terminal 9 is provided with a mounting portion 11.11,
A filamentary cathode 12 is stretched between the mounting portions 11.11. The inner end of the control electrode terminal 10 is provided with another attachment portion 13.13.
A curved mesh that is convex toward the substrate 2 and diffuses electrons is stretched between them to form the control electrode 14 .

Reference numeral 15 in the figure is an exhaust hole, which is sealed with a lid member 16 when the gas inside the envelope 5 is exhausted and the inside is brought into a high vacuum state in the manufacturing process of the fluorescent light emitting tube 1.

Further, each of the terminals 8, 9, and 10 is arranged so that it can be attached to a standard-defined socket, etc., and can be replaced with a single touch.

When a large display screen is constructed by arranging a large number of fluorescent light emitting tubes 1 constructed as described above, they can be combined without any gaps as shown in FIG. If you do this, each drum)R
, G, and B are the same even in one pixel, so color mixing is good and all colors are clear. Furthermore, if the display area is the same, a hexagonal shape has a shorter outer circumference than a rectangular shape. That is, since the non-light-emitting portions whose side portions are sealed and fixed are reduced, the effective display area of each fluorescent light emitting tube can be increased.

Next, FIGS. 5 and 6 show a second embodiment.

This fluorescent light emitting tube 17 is for high voltage use.

This is the same front-emitting type as the previous embodiment.

A regular hexagonal substrate 18, a regular hexagonal cylindrical side surface 19, and a regular hexagonal back surface 20 are fixed with bamboo sealing material to form an envelope 21. A graphite layer 22 is deposited in a frame shape on the inner surface of the substrate 18 to form a black back. The graphite! f! Phosphors r, g, and b are adhered to each area within the frame divided by 22 in the same manner as in the first embodiment. And each phosphor r, g, b and graphite Ff! 22
A metal back layer 23 made of an aluminum vapor-deposited film or the like is deposited on the entire surface. A separator 24 made of a conductive material is provided upright on the metal back layer 211 to separate the phosphors r, g, and b.

A high voltage wiring 25 connected to the metal back layer 23 is provided on the inner surface of the side surface portion 19 . The high voltage wiring 25
27 in FIG. This is a cathode terminal provided through the cathode terminal 27 in an airtight manner, and a filament-shaped cathode 29 is stretched on a mounting portion 28 connected to the inner end of the cathode terminal 27. In the figure, 30 indicates each of the phosphors r. ,g
, b, respectively, and each first control electrode 30 is connected to a first control electrode terminal 31 that is airtightly penetrated through the back surface part 20 and connected to the fish. Reference numeral 32 in the figure is a second control electrode common to each of the phosphors r, g, and b, which is configured to control and diffuse electrons emitted from the phosphor-like cathode 29. .

The structure is such that the incoming electrons are accelerated and made to collide with each of the phosphor layers r, g, and b.

When a large display screen is constructed by arranging a large number of fluorescent light emitting tubes 17 configured as described above, the individual fluorescent light emitting tubes can be arranged densely without gaps, which is different from the first embodiment. Similarly, color mixing becomes good and display quality can be improved.

In each of the embodiments described above, three parallel 4
Although an example has been shown in which the display surface is divided into a side shape and each of the phosphors r, g, and b is applied to each divided display area, the display surface may be divided in other manners as well. Good 0For example, as shown in Figure 8, it may be divided horizontally into three parts, and when a large number of parts are combined, the same color side may be displayed.Furthermore, as shown in Figure 10, the display surface may be divided into three parts, red, green, and blue without being divided. It is also possible to create three types of fluorescent light emitting tubes that emit light in a single color, and use the three fluorescent light emitting tubes that emit light in different colors as one set of pixels to form a display screen.

In addition, the shape of the substrate part does not have to be a regular hexagon, and the shape of the 11th
The fluorescent tubes may have a slightly elongated hexagonal shape as shown in the figure; in this case as well, the fluorescent light emitting tubes can be closely arranged without gaps, as described in the description of the embodiment. In addition, although the side portions in the embodiments were each shaped like a regular hexagonal tube, other shapes may also be used. For example, as shown in FIGS. The part 35 side may be a cylindrical side part 36. In this case, the back part 35 is constituted by a circular plate separate from or integral with the side part 36. Note that the side surface portion 36 having such a shape can be produced by heating only one end of a round glass tube and forming it into a hexagonal tube shape.

[Effects of the Invention] The fluorescent light emitting tube of the present invention has the following effects because the envelope is constituted by a hexagonal substrate portion, a cylindrical side surface portion, and a back surface portion.

(1) Since the display surface can be configured so that dots of different colors are adjacent to each other, two and three colors can be mixed well, resulting in excellent color balance.

(2) The distance between each dot can be made equal,
The effective light emitting area can be widened.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the first embodiment, FIG. 2 is a diagram showing the dot wiring pattern of the board part in the same embodiment, and FIG.
The figure is a sectional view of the same embodiment, FIG. 4 is a bottom view of the same embodiment, FIG. 5 is a sectional view of the second embodiment, FIG. 6 is a bottom view of the same embodiment, and FIG. 7 is a bottom view of the first embodiment. Or the arrangement of the second embodiment! Figures 8 to 10 are diagrams showing the state 1g in which a large number of fluorescent light emitting tubes are combined together with other aspects of the dot wiring pattern in each embodiment, and Figure 11 is a diagram showing the circuit board section. FIG. 7 is a diagram illustrating, as an example, a part of a large display screen having another shape. T!
R#-・l, 17... Fluorescent light emitting tube, 2.18... Substrate part, 3
．． 19... Side part, 4, 20... Back part, 5.21
...Envelope, 6...Anode conductor constituting the anode, 12
゜29...Filamentary cathode, 14...Control electrode. 23...Metal back layer constituting the anode, 30...
1st control m electrode, 32-... 2nd control m electrode, r, g, b.
...Fluorescent material. Patent applicant Futaba Electronics Co., Ltd. Figure 1 Figure 2 Figure 4 Figure 6 Figure 12 Figure 13 Figure 14

Claims (3)

[Claims] (1) Fluorescence emission in which a filament-shaped cathode that emits electrons, a control electrode that controls the electrons, and an anode coated with phosphor are arranged in an envelope maintained in a high vacuum atmosphere. The tube includes a hexagonal substrate portion provided with a phosphor of an anode, a back portion disposed opposite to the substrate portion and having terminal portions such as various electrodes penetrating therethrough, and the substrate portion. A fluorescent light emitting tube characterized in that the envelope is constituted by a cylindrical side surface portion provided between a peripheral edge of the tube and the back surface portion. (2) The substrate portion, side portions, and back portion of the envelope are each made of independent glass materials, and the envelope is constructed by bonding and sealing each of these glass materials together with a glass sealing material. A fluorescent light emitting tube according to claim 1. (3) A patent claim in which the shape of the substrate part is a regular hexagon, and the light emitting area of the substrate part is divided into three parts, and three types of phosphors emitting light in each color of red, green, and blue are coated with one type each. range 1
The fluorescent light emitting tube according to item 1 or 2.